(19)
(11) EP 0 429 067 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.09.1992 Bulletin 1992/40

(43) Date of publication A2:
29.05.1991 Bulletin 1991/22

(21) Application number: 90122193.7

(22) Date of filing: 20.11.1990
(51) International Patent Classification (IPC)5: H01P 1/203
(84) Designated Contracting States:
DE FR GB

(30) Priority: 20.11.1989 JP 301104/89
20.11.1989 JP 301105/89

(71) Applicant: SANYO ELECTRIC CO., LTD.
Moriguchi-shi, Osaka (JP)

(72) Inventor:
  • Itou, Atsushi
    Daito-shi, Osaka-fu (JP)

(74) Representative: Glawe, Delfs, Moll & Partner 
Patentanwälte Postfach 26 01 62
80058 München
80058 München (DE)


(56) References cited: : 
   
       


    (54) Band-pass filter using microstrip lines.


    (57) A microwave band-pass filter of interdigital type employing microstrip lines and a filter characteristic adjusting method thereof are disclosed. The microwave band-pass filter includes plural stages of resonant lines (11,12,13). Furthermore, the resonant line includes a short-circuit portion (1c), an open portion (1a) and a connection portion (1b). The short-circuit portion has its one end grounded and the open portion has its one end open. The connection portion is interposed between the short-circuit portion and the open portion and has its width gradually increased from both sides of the short-circuit portion to both sides of the open portion.







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